import java.io.*;

public class Read implements Runnable {

   DataInputStream in;

   public void setDataInputStream(DataInputStream in) {

      this.in = in;

   }

   public void run() {

      double result=0;

      while(true) {

        try{ result=in.readDouble();

             System.out.println("圆的面积:"+result);

             System.out.print("输入园的半径(放弃请输入N):");

        }

        catch(IOException e) { 

             System.out.println("与服务器已断开"+e);

             break;

        }   

      }

   }

}
